JON LOMBERG / SCIENCE PHOTO LIBRARY JON LOMBERG / SCIENCE PHOTO LIBRARY
Dinosaur extinction. Artwork of a dinosaur beneath a meteor shower in the evening sky. Such a display may have preceded the large asteroid impact some 65 million years ago that is thought to have led to the extinction of the dinosaurs. The impact would have thrown trillions of tonnes of dust into the atmosphere, blocking out sunlight and leading to a catastrophic cooling of the Earth's climate.
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